The new parts are nowhere near the same as the older parts. Also, the parts costs can be quite high, especially for lateral MOSFETs, we have a limited number of earlier versions that are no longer available, and if we do not have these available the entire set needs to be replaced with the newest version and then the amp needs to be tested and possibly adjusted if there are stability issues. When this is the case, there is a LOT of additional work necessary to determine any other damage that was caused, and the costs can grow quickly. The other problem is that sometimes we see an amp that has had a failed repair attempt by a service tech who was in over their head. We rely heavily on tracking of the serial number in order to determine where in the production cycle an amp sits, and which revision level it was built to plus any factory authorized updates that were done to the amp. The challenge with these amps (and some others) is that over their ~10 year lifespan, there were multiple versions due to parts being discontinued, changes necessary to utilize revised parts, etc. Carbines need to be returned to the factory or to certain specific service centers (there are some countries that have a service center that can support these amps, but they are carefully selected).
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